Yes, in reality, it's not easy to upgrade to the latest version. Those who have been working on this for a long time can get things back on track, but those who are new to this are finding it hard to get the site working normally with default theme (bootstrap5), Blocks don't work, some images no longer appear, product zoom works on some images and not on others, many things out of place. It's really frustrating to upgrade and have your site broken, they should do a post explaining what we have to do to make everything work perfectly.

Is there any official guide to help fix issues when upgrading to the new version, especially regarding the default theme (Bootstrap 5) and content blocks?